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I would go with

Their assigned block has a prefix of 20 and they need to break that into 10 subnets. Obviously we can't use 20 as that is their base prefix. So we move to 24 and see if that will give us the needed number of subnets. 24 minus 20 gives us 4 bits for the subnets. 2 to the 4th power is 16. If we are using "ip subnet zero" that yields 16 subnets. Without "ip subnet zero" we lose 2 and it yields 14 subnets so either way we have at least 10.

To rule out option d) let's run it with 1 less than 24, that is 23. 23 minus 20 = 3. 2 to the 3rd power = 8. So even if we are using "subnet zero, that still doesn't give us 10 subnets.

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